Cylindrical boiler



Dec. 22, 1964 D. vANDAl.

CYLINDRICAL. BOILER Filed June 24, 1963 /N VEN TOR 2e/,ms 144mm;

PATENT AGE/V7'- United States Patent Oli tice 3,162,178 Patented Dec. 22, 1964 3,162,178 CYMNDMCAL BGILER Delphis Vandal, 2030 Hanover Road, Mount Royal, Quebec, Canada Filed June 24, 1963, Ser. No. 289,929 1 Claim. (Cl. 122-95) The present invention relates to boilers, and more particularly to gas or oil tired boilers for generating steam or supplying hot water.

The boiler in accordance with the present invention is an improvement over the boilers described and claimed in Canadian Patent 644,797 dated July 17, 1962, and also Canadian Patents 452,256 and 598,835 of November 2, 1948 and May 3l, 1960 respectively, by the same inventor.

In practice, oil tired boilers fail much more frequently due to malfunctioning of the oil burner itself than of the boiler proper. It is, therefore, standard practice to provide a standby boiler, equipped with an oil burner, which is normally idle and is operated upon failure of the primary boiler assembly. This represents a substantial capital investment which is almost non-productive and, moreover, a second boiler assembly occupies expensive space.

The general object of the present invention resides, therefore, in the provision of a boiler having two combustion chambers, each adapted to be associated with an oil burner or gas burner, resulting in a boiler assembly which may be provided with two burners, one being a standby burner, whereby upon failure of the primary burner, the standby burner can take over, thereby eliminating, in most applications, the necessity of providing an entire standby boiler and burner assembly.

Yet another important object of the present invention resides in the provision of 4a boiler of the character described, which may be provided with one or two burners, and when having two burners, the burners can be operated alternatively or simultaneously.

Yet another object of the present invention resides in the provision of a boiler of the character described, which has a very small height compared to its heating capacity, all the elements of the burner being enclosed in a single cylindrical shell.

Yet another object of the present invention resides in the provision of a boiler of the character described, which has a high thermal efficiency because the combustion chambers are entirely surrounded by water.

Still another object of the present invention resides in the provision of a boiler of the character described, which is of relatively simple and inexpensive construction.

The foregoing and other important objects of the present invention will become more apparent during the following disclosure and by referring to the drawings, in which:

FIGURE 1 is a lonigtudinal section, partially in elevation, of the boiler;

FIGURE 2 is a top plan view; and

FIGURE 3 is an end view, partially in cross-section.

Referring now more particularly to the drawings in which like reference characters indicate like elements throughout, reference 1 indicates a cylindrical elongated shell, which encloses all the elements of the boiler. A transfer box 2 is defined in the lower center portion of shell 1, while a smoke box 3 is defined in the central upper portion of shell 1 above transfer box 2.

A lower set of tire tubes 4 are horizontally disposed on each side of transfer box 2 and establish communication between the top of said transfer box 2 and end transfer chambers 5, at each end of shell 1.

An upper set of lire tubes 6 are horizontally disposed on each side of smoke box 3 and make communication between the end transfer chambers 5 and smoke box 3. Smoke box 3 has a smoke discharge opening 7 at the top of the shell 1 in the center thereof.

Disposed below each set of lower fire tubes 4, is a cylindrical horizontally disposed combustion chamber 8, which is supported -by and passes through transverse wall 9 of transfer box 2 and end Wall 10 of shell 1. There are two symmetrically disposed combustion chambers 8, one of each side of central transfer box 2, and these cornbustion chambers are spaced from the cylindrical wall of shell 1.

An oil burner 11 is fitted in the outer end of one or both combustion chambers 8. If only one burner 11 is used, the other combustion chamber is closed by a removable cover plate 21 at its outer end. v Water transfer tubes 12 extend across central transfer box 2, being supported by and going through transverse walls 9, so as to establish communication between the water spaces at each end of the boiler and on each side of the combustion chambers 8 for the free circulation of the water at the level of the transfer box 2.

The transverse walls 9 have a semi-circular shape and are directly secured to the side wall of shell 1, and the part of shell 1 defining the transfer box 2 is lined with asbestos lining 13 and with refractory brick 13.

The .transfer box 2 is closed at its top by a transverse top plate 14, which is secured to the walls 9 and to the shell 1. Stays 15 connect top plate 14 of transfer box 2 to bottom plate 16 to smoke box 3, said bottom plate also extending completely across the shell 1 and being spaced from top plate 14, so as to leave passage for free water circulation from one end of the shell to the other end between the smoke box and the transfer box.

The transverse side walls 17 of the smoke box 3 are of substantially semi-circular shape and are directly secured at their edge to the cylindrical side Wall of shell 1.

The outer set of ire tubes 6 are supported by and extend through transverse walls 17 at their inner end and are supported by and extend through end walls 10 of shell 1 at their other end.

The end transfer chambers 5 are defined by the end wall 10 and by a head cover 1S, which is removable and is preferably lined on the outside with insulation 19. The end transfer chambers S are further defined by the extension of the cylindrical wall of shell 1, and at the bottom by a concave flange 20, spacedly surrounding the outer opening of combustion chamber 8.

The shell 1 has below approximately the center of each combustion chamber S a water return inlet 22. Water outlets 23 are provided at the side of shell 1 and at the top adjacent to the smoke opening 7, and openings 24 and 25 are provided on the top of shell 1 for the insertion of a pressure gauge and a safety valve respectively.

The end walls 10 have, between tire tubes 4 and 6 and between tubes 6 at the top portion of shell 1, cleaning openings which `are normally closed by plugs 26.

The shell 1 is supported in horizontal position by any suitable means, such as supports 27.

The combustion gases produced by one or the other, or by both oil burners 11, travel from the central transfer box 2 through the lower set of re tubes 4 into end transfer chambers 5 at both ends of shell 1, then pass through the upper set of lire tubes 6, enter smoke box 3, and are discharged by opening 7 into the flue (not shown) connected thereto.

Water, -to be heated, completely surrounds both cornbustion chambers S and all ythe lire tubes, and there is free water circulation between the two end sections of the boiler between top plate 14 of transfer box 2 and bottom plate 16 of smoke box 3, and also through transfer tubes 172; thus complete pressure yequalization isV obtainedbe-k tween the two end sections of the boiler.

Because the combustion chambers 8 are completely' surv i: ,at their inner ends and supported by rounded byV water, there is no need of lining the samev with refractory'brick or the like; only the central transfer box 2 is so lined'. Y

The user may employ only one-burner 11 at Vone-'end of the boiler or two burners at both ends of *the boiler, in which case one burner will normally be a standby burner in case of failure of the primary burner. Thus with the system of the invention, no standby boiler will normally be required. Y 1

While a preferred embodiment inaccordancewith the present invention has beenkillustrated and described, it is f understood that various modifications may'beresorted to without departing from the spirit and' scope ofy the appended claim. l v

What I claim is:

A boiler comprising a horizontally disposed elongated shell, having flat-end Walls and a cylindrical lateral wall, a transfer box located in the bottom center portionv of said shelland partly defined by said shell cylindrical` Wall, a horizontal top plate and transverse vertical walls having a semi-circular shape, said plate and said vertical transverse walls directly secured to said cylindrical wall, a smoke box spacedly disposed above said transfer box and located in the upper central portion of said shell and having arsmoke discharge opening at the top of said shell, upper and lower sets of fire tubes located within said shell on each side of said transfer box and smoke box and in vcomm-unicationrwith said boxes respectively Ysaid shell end walls atftheir outer ends,.head covers spaced from said shell end walls and defining therewith transfer chambers for establishing communication between the outer ends of `said upper andV lower sets of fire tubes, and

combustion chambers mounted within said shell lspaced y[from said cylindrical wall, rdisposed on-'each side of said central transfer box and, in communication therewith at their innerv ends and passing through said shell end walls and opening to the exterior at their outer ends, saidV outer ends adapted to receive a burner, and water transfer tubes extending yacross said central 'transfer box and through said transverse vertical walls and supported by the latter, and opening into the' shell on each sider rof said combustion chambers.

References Cited'by the xamner Y UNITED .STATES PATENTS l RoBERT A. yOLEARY, Primary," Examiner. MEYER PERLIN, Examiner.

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